Escape to close leaderF window shows error when you have only spaces entered

[habamax]

• vim or neovim?
  • vim
  • neovim
• Output of vim --version or nvim --version: vim 8.1, patches 1-477
• Output of :echo has("python"): 0
• Output of :echo has("python3"): 1
• Output of :echo &pythondll(only vim, not neovim): python27.dll
• Output of :echo &pythonthreedll(only vim, not neovim): python37.dll
• Output of :py print(sys.version): Could not load library python27.dll
• Output of :py3 print(sys.version): 3.7.0
• Output of :echo g:Lf_Debug_Cmd: rg --no-messages --files "."
• Operating system:
  • Linux
  • Mac OS X
  • Windows
  • Etc.
• Configurations related to LeaderF in vimrc:

	let g:Lf_StlSeparator = { 'left': '', 'right': '' }
	let g:Lf_ShortcutF = '<leader>ff'
	let g:Lf_Shortcutb = '<leader>b'
	let g:Lf_WindowHeight = 0.30
	cabbrev lf LeaderfFile
	nnoremap <leader>fh :LeaderfHelp<CR>
	nnoremap <leader>fm :LeaderfMru<CR>
	nnoremap <leader>fs :LeaderfSelf<CR>
	nnoremap <leader>fc :LeaderfColorscheme<CR>
	nnoremap <leader>/ :LeaderfLine<CR>
	nnoremap <leader>fdd :LeaderfFile ~/docs<CR>
	packadd leaderF

Describe your question, feature request, or bug.

Error when close the leaderf window

Steps to reproduce

1. :LeaderfFile
2. input 2+ spaces
3. press escape

Actual behaviour

Expected behaviour

LeaderF Window should be closed without errors.

[habamax]

I have fixed it by adding the following to cli.py:

    def writeHistory(self, category):
        if not self._and_delimiter.strip():
            return
...

If you okay with that I can try to provide a PR.

[Yggdroot]

Thanks for your report. Your fix seems to make writeHistory() return at the beginning always, so that the history feature is broken.
I have fixed it. Thanks.

[habamax]

Thx, fixed for me.